The type of n00b who would use derogatory rail slang like SCAXliner or Amtrash, complains about the tuning of train horns, tends to endanger his or other's lives for a good photo, and angers railroad crews through his actions.

A person who either:
A. Calls someone a Foamer, for simply disagreeing with them.
B. Cares enough about the fact that someone might think they are a foamer that they would make an exclamation that they are not a foamer
or C. Purposely acts in a certain way for the purpose of not being considered a foamer.

The Foamer actively avoided any actions which could portray him as a foamer.